updated docs to point to official vs.com docs
updated docs to point to official vs.com docs

kasubram/vsts-agent,lkillgore/vsts-agent,kasubram/vsts-agent,kasubram/vsts-agent,Microsoft/vsts-agent,kasubram/vsts-agent,Microsoft/vsts-agent,lkillgore/vsts-agent,Microsoft/vsts-agent,Microsoft/vsts-agent,lkillgore/vsts-agent,lkillgore/vsts-agent